String replace

[JimmyFo]

Hi, I am looking to to some string manipulation. I need to replace the last, and only last "." in a filename with "_thumb."

String function "Replace" replaces all of them - is there a way to replace just the rightmost period?

Thanks,
James

 

[JohnH]

You could use String.LastIndexOf method in combination with String.Substring method.
You could also do it with help of System.IO.Path.GetFileNameWithoutExtension and IO.Path.GetExtension methods.